Jewelry metal surface treatment process

Abstract

The invention relates to a jewelry metal surface treatment process which comprises the following steps: S1, after jewelry is processed into a blank, carrying out primary processing and polishing, and after the surface is flattened, carrying out secondary fine polishing until the surface is smooth and free of recesses and scratches; s2, the polished jewelry is put into a sulfuric acid solution to be subjected to acid pickling so as to remove impurities on the surface, and then the jewelry is washed with clear water; s3, carrying out sand blasting treatment on the washed jewelry by adopting glass quartz sand of 53-150 microns and glass quartz sand of 150-220 microns, so that an antique visual effect is generated on the surface; s4, the jewelry subjected to sand blasting is subjected to wire drawing on a wire drawing machine of a tungsten steel wire drawing needle or a diamond wire drawing needle, so that uniformly-distributed wire bottom textures are generated on the surface; s5, acid pickling and water washing in the step 2 are repeated; and S6, the jewelry subjected to wire drawing is subjected to sand blasting treatment through diamond powder of 40-220 micrometers, impact concave facets which are evenly distributed are generated on the surface, and the surface generates the starlight shining effect under natural light.

Description

Technical Field

[0001] This application belongs to the field of metal surface treatment technology, specifically relating to a metal surface treatment process for jewelry. Background Technology

[0002] Metal surface treatment processes are widely used in the manufacture of high-end metal jewelry. Gold jewelry mainly undergoes processes such as wire drawing, acid pickling, and cleaning to enhance the luster, texture, and durability of the gold surface. However, existing wire drawing processes result in gold surfaces with issues such as color differences, pinholes, scratches, and uneven, discontinuous textures. Summary of the Invention

[0003] To overcome the problems existing in the related technologies, this application aims to provide a metal surface treatment process for jewelry, so that the surface of the jewelry produces a star-like shimmering effect under natural light.

[0004] This application is achieved through the following technical solution.

[0005] This technical solution provides a surface treatment process for jewelry metal, including the following steps:

[0006] S1. After the jewelry is processed into a blank, it undergoes preliminary processing and polishing. Once the surface is flat, it undergoes a second fine polishing until the surface is smooth without dents or scratches.

[0007] S2. After polishing, the jewelry is placed in a sulfuric acid solution for heating and acid washing to remove surface impurities, and then rinsed with water.

[0008] S3. The washed jewelry is first sandblasted with 53-150 micron glass quartz sand to give the surface a uniformly distributed matte finish, and then a second sandblasting is performed with 150-220 micron glass quartz sand to give the surface an antique visual effect.

[0009] S4. The sandblasted jewelry is then drawn on a wire drawing machine with a tungsten carbide or diamond wire drawing needle to create a uniformly distributed wire texture on the surface.

[0010] S5. Repeat the pickling and rinsing process in step 2;

[0011] S6. The wire-drawn jewelry is sandblasted with diamond powder of 40-220 micrometers to form an impact concave surface. The impact concave surface produces several evenly distributed small holes with a diameter of 40-200 micrometers and a depth of 10-40 micrometers. The surface produces a starlight effect under natural light.

[0012] S7. After washing, put the jewelry in the oven at 100-200 degrees Celsius for more than 30 minutes until it is completely dry.

[0013] The process of this technical solution is based on wire drawing and other processes combined with polishing and sandblasting. After the process, the jewelry has a uniformly distributed impact concave surface. Under the impact of diamond powder, the impact concave surface is a surface containing very fine dust and sharp holes. The holes can reflect light and produce a sparkling effect similar to starlight.

[0014] In one or more embodiments, the initial processing and polishing are performed using 400-600 grit sandpaper.

[0015] In one or more embodiments, secondary fine polishing is performed using sandpaper with a grit of 800-1200.

[0016] 4. The jewelry metal surface treatment process according to claim 1, characterized in that the sulfuric acid solution for pickling is prepared by mixing sulfuric acid and water in a ratio of 8:2, the temperature is 60-100 degrees Celsius, and the pickling time is 60-180 seconds.

[0017] In one or more embodiments, the sandblasting time for the first sandblasting treatment is not less than 30 seconds, and the sandblasting air pressure is 10-20 MPa.

[0018] In one or more embodiments, the second sandblasting treatment uses a mixture of glass quartz sand of three specifications: 80#, 100# and 120#, in a ratio of 1:1:1, with a sandblasting time of not less than 30 seconds and a sandblasting air pressure of 10 MPa.

[0019] In one or more embodiments, the blasting pressure for blasting diamond powder is 10-20 MPa, and the blasting time is 30-100 seconds.

[0020] In one or more embodiments, the jewelry is gold jewelry.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Detailed Implementation

[0022] The technical solutions in some embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] The technical solutions of the embodiments of this application are described in detail below.

[0024] This embodiment describes a metal surface treatment process for jewelry. Taking gold jewelry as an example, the process includes the following steps:

[0025] 1. Rough processing: After the gold jewelry is processed into a blank according to the shape of the jewelry, it is first processed and polished with 400-600 grit sandpaper to make the surface of the jewelry flat. Then, it is processed and polished with 800-1200 grit sandpaper until the surface of the jewelry is smooth without dents or scratches before proceeding to the next step.

[0026] 2. Pickling: The polished jewelry is immersed in a sulfuric acid solution for pickling. The ratio of concentrated sulfuric acid to water in the sulfuric acid solution is 8:2, the temperature is 60-100 degrees Celsius, and the pickling time is 60-180 seconds. The purpose is to dissolve impurities such as stains, dust, and polishing powder on the surface of the polished gold jewelry, ensure that the purity of the gold jewelry reaches 99.9% or more, and make the gold surface more reddish.

[0027] 3. Water washing: Immerse the acid-washed gold jewelry in plenty of running water for at least 180 seconds. During the washing process, continuously add fresh water to ensure that there is no sulfuric acid residue or other impurities after the jewelry is cleaned.

[0028] 4. First glass quartz sand blasting treatment: Use a sandblasting machine to load quartz glass sand (also known as water sand or glass microspheres) with a diameter of 53-150 micrometers and spray it evenly on the surface of the gold jewelry. The sandblasting time is not less than 30 seconds and the air pressure is 10-20Mpa, so that the surface of the jewelry produces a uniform and harmonious matte finish.

[0029] 5. Second glass quartz sandblasting treatment: The jewelry processed with quartz glass sand is polished by sandblasting with glass quartz sand of different specifications on its surface. The glass quartz sand is made of three specifications: 80#, 100# and 120#, mixed in a 1:1:1 ratio, with a particle diameter of 150-220 micrometers. The sandblasting time is not less than 30 seconds and the air pressure is 10 MPa, so as to give the jewelry an antique visual effect.

[0030] 6. Wire drawing process: The wire drawing machine uses tungsten steel wire drawing needles or diamond wire drawing needles (0.06mm-0.15mm) to draw evenly distributed wire patterns on the gold jewelry after the second quartz glass sand treatment. The specific pattern can be selected according to actual needs.

[0031] 7. Repeat steps 2 (acid treatment) and 3 (water washing) on ​​the brushed gold jewelry to remove impurities and gold dust generated during the brushing process.

[0032] 8. Starlight Effect Processing: Using a sandblasting machine, artificial diamond powder with a size of 40-220 microns is loaded onto the previously treated gold jewelry for sandblasting. The air pressure is 10-20 MPa, and the duration is 30-100 seconds. The specific duration can be determined according to actual requirements. The more concave facets are impacted, the longer the duration should be, so that the surface of the jewelry forms impact concave facets. These impact concave facets produce several evenly distributed small holes with a diameter of 40-200 microns and a depth of 10-40 microns. The surface produces a starlight effect under natural light.

[0033] 9. Cleaning and Baking: Rinse the diamond-treated jewelry again with clean water for 180 seconds. After cleaning, place it in an oven at 100-200 degrees Celsius for at least 30 minutes, until the jewelry is completely dry and no water residue remains. This high temperature dries the moisture inside the small holes. Simultaneously, if the jewelry has perforations, acid residue may remain inside. During the drying process, the acid will flow out from the perforations, causing the surrounding area to turn black. This can be used to check for quality issues related to perforations in the jewelry.

[0034] The jewelry processed in this embodiment has uniformly distributed impact concave surfaces on its surface. Under the impact of diamond powder, the impact concave surfaces are surfaces containing very fine dust-like pores. These pores can reflect light, producing a sparkling effect similar to starlight.

[0035] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A metal surface treatment process for jewelry, characterized in that, Includes the following steps: S1. After the jewelry is processed into a blank, it undergoes preliminary processing and polishing. Once the surface is flat, it undergoes a second fine polishing until the surface is smooth without dents or scratches. S2. After polishing, the jewelry is placed in a sulfuric acid solution for heating and acid washing to remove surface impurities, and then rinsed with water. S3. The washed jewelry is first sandblasted with 53-150 micron glass quartz sand to give the surface a uniformly distributed matte finish, and then a second sandblasting treatment is performed with 150-220 micron glass quartz sand to give the surface an antique visual effect. S4. The sandblasted jewelry is then drawn on a wire drawing machine with a tungsten carbide or diamond wire drawing needle to create a uniformly distributed wire texture on the surface. S5. Repeat the pickling and rinsing process in step 2; S6. The wire-drawn jewelry is sandblasted with diamond powder of 40-220 micrometers. The sandblasting pressure is 10-20 MPa and the sandblasting time is 30-100 seconds, so that the surface forms an impact concave surface. The impact concave surface produces several evenly distributed small holes with a diameter of 40-200 micrometers and a depth of 10-40 micrometers. The surface produces a starlight effect under natural light. S7. After washing, put the jewelry in the oven at 100-200 degrees Celsius for more than 30 minutes until it is completely dry.

2. The jewelry metal surface treatment process according to claim 1, characterized in that, The initial processing and polishing are done using 400-600 grit sandpaper.

3. The jewelry metal surface treatment process according to claim 1, characterized in that, The second fine polishing is done using sandpaper with a grit of 800-1200.

4. The jewelry metal surface treatment process according to claim 1, characterized in that, The sulfuric acid solution used for pickling is prepared by mixing sulfuric acid and water in a ratio of 8:2, at a temperature of 60-100 degrees Celsius, and for a pickling time of 60-180 seconds.

5. The jewelry metal surface treatment process according to claim 1, characterized in that, The sandblasting time for the first sandblasting treatment should be no less than 30 seconds, and the sandblasting air pressure should be 10-20 MPa.

6. The jewelry metal surface treatment process according to claim 5, characterized in that, The second sandblasting treatment uses a mixture of 80#, 100# and 120# glass quartz sand in a ratio of 1:1:1, with a sandblasting time of no less than 30 seconds and a sandblasting air pressure of 10 MPa.

7. The jewelry metal surface treatment process according to claim 1, characterized in that, The jewelry in question is gold jewelry.